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Dr. Patrick E. Callahan, MD

Anesthesiology (Anesthesiology Physician)

  • Medicare participating

At a glance

Medical school
Eastern Virginia Medical School (1991)
Years since graduation
35
In the NPI registry since
2006
Medicare patients seen, 2024
362

The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is

Education and training

  • 1991Medical school: Eastern Virginia Medical School
  • 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier

Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).

Specialties and state licenses

  • Anesthesiology Physician primary
    MD license D0046630
  • Pain Medicine Physician
    MD license D0046630

As reported to the NPI registry. To confirm a license is current, check the state medical board.

Map: Anesthesiology per capita by county →

Where they work

Hospitals

Medical groups

Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.

Medicare patients and services

Medicare patients, 2024
362
Services billed
4,019
Patients’ average age
70
Most frequent Medicare services, 2023
ServiceTimesPatients
Established patient office or other outpatient visit, 20-29 minutes819294
Chronic pain management and treatment, monthly bundle including, diagnosis; assessment and monitoring; administration of a validated pain rating scale or tool; the development, implementation, revision, and/or maintenance of a person-centered care plan tha810281
Established patient office or other outpatient visit, 30-39 minutes574294
Destruction of lower or sacral spinal facet joint nerves using imaging guidance, each additional facet joint312105
Injection of substance into lower spine canal using imaging guidance211145
Destruction of lower or sacral spinal facet joint nerves using imaging guidance, single facet joint186105
Injection of lower or sacral spine facet joint using imaging guidance, single level13474
Injection of lower or sacral spine facet joint using imaging guidance, second level13474
New patient office or other outpatient visit, 45-59 minutes7575
Injection of upper or middle spine facet joint using imaging guidance, single level5546

Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.

Medicare prescriptions

Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.

Sources

NPI registry (CMS NPPES, November 2026; record last updated November 8, 2023), Medicare Care Compare, Medicare Physician & Other Practitioners (2024), Medicare Part D Prescribers (2024) and Open Payments (2025). Information is self-reported or billed data and may be out of date; call before visiting.

NPI 1447218060. Official NPI registry record (opens in a new tab). Clinicians can correct their information in NPPES; changes appear here after our next monthly update.